RE:RE:RE:RE:RE:RE:Globe & Mail RE: Pot Impaired Driving - Highlights CannabixYou know, legislation could be created that says if the breathalyzer shows cannabis consumption within last 2 hours, then you get to either give blood for a more accurate blood level, or refuse and get DUI. Until a device can accurately test levels, it may be a multi system approach. But I know even blood levels isn't necessarily a good accurate measure of impairment.